JP6739007B2 - Speaker device - Google Patents

Description

The present disclosure relates to a speaker device.

Patent Document 1 discloses a bass reflex type speaker device. The speaker device disclosed in Patent Document 1 includes an enclosure, a speaker unit, and a duct. The speaker unit is arranged inside the enclosure and attached to the enclosure. The duct is disposed inside the enclosure to ventilate the inside of the enclosure and the outside of the enclosure. In this speaker device, the air in the duct resonates when the speaker unit vibrates at a predetermined low frequency. As a result, in this speaker device, the low frequency sound output is enhanced.

JP-A-04-049999

The present disclosure provides a speaker device that can improve sound quality.

A speaker device according to the present disclosure includes a speaker housing, a first speaker unit provided on a first wall portion of the speaker housing, and an acoustic tube that communicates the inside and the outside of the speaker housing. The acoustic tube has a predetermined length and is spirally bent and housed in the speaker housing.

The speaker device according to the present disclosure can improve sound quality.

FIG. 1 is a diagram schematically showing a configuration example of an audio system including the speaker device according to the first embodiment. FIG. 2 is a perspective view schematically showing a configuration example of the speaker device according to the first embodiment. FIG. 3 is a perspective view schematically showing a configuration example of the speaker device according to the first embodiment. FIG. 4 is a perspective view schematically showing a configuration example of the speaker device according to the first embodiment. FIG. 5 is a perspective view schematically showing an example of the internal structure of the speaker device according to the first embodiment. FIG. 6 is a perspective view schematically showing an example of the internal structure of the speaker device according to the first embodiment. FIG. 7 is a perspective view schematically showing an example of the internal structure of the speaker device according to the first embodiment. FIG. 8 is a side view schematically showing an example of the internal structure of the speaker device according to the first embodiment. FIG. 9 is a perspective view schematically showing a configuration example of the acoustic tube of the speaker device according to the first embodiment. FIG. 10 is a side view schematically showing a configuration example of a pedestal portion included in the speaker device according to the first embodiment and its periphery. FIG. 11 is a perspective view schematically showing a configuration example of a tweeter unit included in the speaker device according to the first embodiment. FIG. 12 is a top view schematically showing a configuration example of the tweeter unit included in the speaker device according to the first embodiment. FIG. 13 is a diagram schematically showing an example of the relationship between the sound pressure and the frequency of the woofer unit included in the speaker device according to the first embodiment. FIG. 14 is a diagram schematically showing an example of the relationship between the amplitude and frequency of the diaphragm of the woofer speaker unit included in the speaker device according to the first embodiment. FIG. 15 is a diagram schematically showing an example of the relationship between impedance and frequency of the woofer speaker unit included in the speaker device according to the first embodiment. FIG. 16 is a block diagram showing a configuration example of components related to boost control of the woofer speaker unit included in the speaker device according to the first embodiment.

Hereinafter, embodiments will be described in detail with reference to the drawings as appropriate. However, more detailed description than necessary may be omitted. For example, detailed description of well-known matters and duplicate description of substantially the same configuration may be omitted. This is for avoiding unnecessary redundancy in the following description and for facilitating understanding by those skilled in the art.

It should be noted that the accompanying drawings and the following description are provided for those skilled in the art to fully understand the present disclosure, and are not intended to limit the claimed subject matter by them.

In addition, each drawing is a schematic view, and is not necessarily strictly illustrated. Further, in each drawing, substantially the same constituent elements are given the same reference numerals, and the description thereof may be omitted or simplified.

(Embodiment 1)
Hereinafter, the speaker device according to the first embodiment and an acoustic system including the speaker device will be described with reference to FIGS. 1 to 15.

[1-1. Sound system overall configuration]
FIG. 1 is a diagram schematically showing a configuration example of an acoustic system 100 including the speaker device 1 according to the first embodiment. FIG. 1 shows a perspective view of the acoustic system 100 viewed from the front side. In the present embodiment, the side of the music player 101 on which the operation unit 110 is provided is the front.

The sound system 100 includes one music player 101 and two speaker devices 1. The numbers of the music player 101 and the speaker device 1 are not limited to the above numerical values. The sound system 100 may include two or more music players 101. The number of speaker devices 1 included in the sound system 100 may be one or three or more.

The speaker device 1 is connected to the music player 101, and can convert a sound signal (audio signal) output from the music player 101 into a sound (sound) and output the sound (hereinafter, also simply referred to as “playback”). it can.

The music player 101 is configured to convert signals output from various external devices and music sources into audio signals that can be reproduced by the speaker device 1 and output the audio signals. For example, the music player 101 is an external device wiredly connected through a USB (UNIVERSAL Serial Bus) connection terminal, or an external device wirelessly connected by Wi-Fi (registered trademark), Bluetooth®, or the like. May be configured to receive an audio signal from a music source and output an audio signal, or to receive an audio signal from a music source such as a CD (Compact Disc) player included in the music player 101 or a radio and output an audio signal. May be configured to do so.

[1-2. Speaker device configuration]
Next, the configuration of the speaker device 1 according to the first embodiment will be described with reference to FIGS.

FIG. 2 is a perspective view schematically showing a configuration example of the speaker device 1 according to the first embodiment. FIG. 2 is a perspective view of the speaker device 1 shown in FIG. 1 as viewed from the front oblique direction.

As shown in FIG. 2, the speaker device 1 has a vertically long rectangular parallelepiped shape (Z-axis direction). The speaker device 1 is configured to be supported on a mounting surface (not shown) by a plurality of legs 1g provided on the bottom surface 1f. In addition, in the present embodiment, an example of a configuration in which the speaker device 1 includes four legs 1g is shown, but the number of legs 1g included in the speaker device 1 is not limited to four.

The top surface 1e of the speaker device 1 that faces the bottom surface 1f is configured by the top plate 3. The top plate 3 also constitutes the design of the speaker device 1.

The speaker device 1 includes a top surface 1e and a bottom surface 1f, and a side surface 1a, a side surface 1b, a side surface 1c, and a side surface 1d that are adjacent to the top surface 1e and the bottom surface 1f. In the speaker device 1, the three side surfaces 1 a, 1 b, and 1 c are formed by the exterior net 2. The exterior net 2 also constitutes the design of the speaker device 1. The side surface 1a, the side surface 1b, the side surface 1c, and the side surface 1d forming the four side surfaces of the rectangular parallelepiped form a right-angled rectangular tube.

Note that, in the present embodiment, for convenience, description will be given using three axes of the X axis, the Y axis, and the Z axis. Hereinafter, the direction from the bottom surface 1f to the top surface 1e is defined as the Z-axis positive direction. Further, the direction from the side surface 1a that is the front surface (hereinafter, also referred to as “front surface 1a”) to the side surface 1d that is the back surface (hereinafter, also referred to as “back surface 1d”) is the Y-axis positive direction. Further, the direction from the side surface 1b to the side surface 1c is defined as the X-axis positive direction.

3 and 4 are perspective views schematically showing one configuration example of the speaker device 1 according to the first embodiment. 3 is a perspective view showing a mode in which the exterior net 2 is removed from the speaker device 1 of FIG. 2, and FIG. 4 is a perspective view of the speaker device 1 of FIG.

5, 6, and 7 are perspective views schematically showing an example of the internal structure of the speaker device 1 according to the first embodiment. FIG. 5 is a partial cross-sectional view showing the internal structure by cutting a part of the speaker device 1 shown in FIG. FIG. 6 is a perspective view showing a mode in which the top plate 3 and the side walls 31a and 31c of the speaker housing 31 are removed from the speaker device 1 shown in FIG. FIG. 7 is a perspective view showing a mode in which the top plate 3 and the side walls 31c and 31d of the speaker housing 31 are removed from the speaker device 1 shown in FIG.

The following will be described with reference to FIGS. The speaker device 1 includes a tweeter unit 10, an upper diffuser unit 20, a woofer speaker unit 30, a lower diffuser unit 40, and a pedestal unit 50. The tweeter unit 10 is disposed between the top surface 1e and the upper diffuser unit 20 and includes a plurality of tweeter units 12. The upper diffuser unit 20, the woofer speaker unit 30, and the lower diffuser unit 40 configure a woofer unit 60 in the speaker device 1. The woofer unit 60 is configured to be in charge of reproducing middle and low tones in the speaker device 1. In the speaker device 1, the tweeter unit 10 is configured to be in charge of reproducing high and middle tones.

The tweeter unit 10 is provided with a tweeter frame 11 having a substantially rectangular parallelepiped outline. The tweeter frame 11 includes a substantially square frame-shaped upper edge portion 11a, four pillar portions 11b spaced apart from each other, and a rectangular plate-shaped rear wall portion 11c by integral molding. The four pillars 11b are provided so as to extend from the four corners of the upper edge 11a toward the upper diffuser 20 along the Z-axis direction. The back wall portion 11c is provided so as to extend between two column portions 11b adjacent to each other on the back surface 1d side. The back wall portion 11c closes between the two pillar portions 11b on the back surface 1d side. The upper edge portion 11a has a shape such that the top plate 3 is fitted in alignment with the inner peripheral side of the upper edge portion 11a.

In the tweeter unit 10, inside the tweeter frame 11, three tweeter units 12 that are speakers capable of reproducing high-pitched sound are provided. Each of the three tweeter units 12 is arranged so as to radially emit sound toward the front surface 1a, the side surface 1b, and the side surface 1c of the speaker device 1. That is, the three tweeter units 12 are mutually oriented on a plane substantially parallel to the XY plane (horizontal direction when the speaker device 1 is placed on a placement surface parallel to the horizontal plane). It is arranged so as to be substantially orthogonal.

The tweeter unit 12 is configured so as to have a frequency characteristic capable of suitably reproducing a sound in a frequency band of a predetermined treble range. The frequency band of the predetermined treble range is, for example, a range from 1 kHz to around 100 kHz, a range from 2 kHz to a frequency exceeding 100 kHz, or the like.

Further, in the tweeter unit 10, a directivity control horn 13 is attached to each tweeter unit 12. The directivity control horn 13 has a trumpet shape and is configured to direct the sound reproduced by the tweeter unit 12. Each of the plurality of directional control horns 13 extends from one tweeter unit 12, and the respective directions are set in the direction toward the front surface 1a, the side surface 1b, or the side surface 1c, which is the emission direction of the reproduced sound by the tweeter unit 12. ing. The directivity control horn 13 is open between the support columns 11b of the tweeter frame 11. The directivity control horn 13 is arranged inside the tweeter frame 11 and is fixed to the tweeter frame 11. In other words, each of the three directional control horns 13 is arranged so that one emits sound radially toward the front surface 1a, and the other one emits sound radially toward the side surface 1b. The other one is arranged so as to radially emit sound toward the side surface 1c.

The woofer speaker unit 30 is provided with a rectangular parallelepiped speaker housing 31 whose longitudinal direction is the Z-axis direction. The speaker housing 31 has a hollow structure and has an internal space 34 inside. The woofer speaker unit 30 has an upper woofer speaker unit 32 and a lower woofer speaker unit 33. The speaker housing 31 has an upper wall 31e and a lower wall 31f arranged in parallel with each other. The upper wall 31e is a wall portion facing the upper diffuser portion 20, and the lower wall 31f is a wall portion facing the lower diffuser portion 40. The upper woofer speaker unit 32 is embedded in the opening formed in the upper wall 31e so that the sound output direction is directed to the upper diffuser portion 20. The lower woofer speaker unit 33 is embedded in an opening formed in the lower wall 31f so that the sound output direction is directed to the lower diffuser portion 40.

The upper woofer speaker unit 32 and the lower woofer speaker unit 33 are configured so as to have frequency characteristics capable of suitably reproducing a sound in a predetermined middle and low frequency range. The frequency band of the predetermined middle/low range is, for example, a range from 35 Hz to 5000 Hz. One of the upper wall 31e and the lower wall 31f is an example of the first wall portion of the speaker housing, and the other of the upper wall 31e and the lower wall 31f is an example of the second wall portion of the speaker housing.

As described above, the installation direction is set so that the upper woofer speaker unit 32 emits sound toward the upper diffuser portion 20, and the lower woofer speaker unit 33 emits sound toward the lower diffuser portion 40. The installation direction is set to do so. By providing the upper woofer speaker unit 32 and the lower woofer speaker unit 33 in the woofer speaker unit 30, each of the upper woofer speaker unit 32 and the lower woofer speaker unit 33 vibrates with a relatively small diameter, for example, about 8 cm. Even with the plate 32a or the diaphragm 33a (see FIG. 5), the woofer speaker unit 30 can obtain a relatively large sound pressure.

Further, by providing the upper woofer speaker unit 32 on the upper wall 31e of the speaker housing 31 and the lower woofer speaker unit 33 on the lower wall 31f of the speaker housing 31, it is possible to reduce the size of the speaker housing 31 in the XY plane. Therefore, the installation area of the speaker device 1 can be reduced. One of the upper woofer speaker unit 32 and the lower woofer speaker unit 33 is an example of a first speaker unit, and the other of the upper woofer speaker unit 32 and the lower woofer speaker unit 33 is an example of a second speaker unit. is there.

The upper diffuser portion 20 is provided with an upper frame 21 having a substantially rectangular parallelepiped outline. The upper frame 21 includes four pillars 21a and a substantially square plate-shaped support plate 21b. Each of the four pillars 21a is arranged apart from each other and is formed to extend along the Z-axis direction. The support plate portion 21b is formed integrally with the four pillar portions 21a. The four pillars 21a are arranged at the four corners of the square upper wall 31e of the speaker housing 31 and the four pillars 11b of the tweeter frame 11, respectively. The support plate portion 21b is formed by extending along the upper wall 31e. The upper woofer speaker unit 32 is arranged through an opening formed in the support plate portion 21b, and the diaphragm 32a of the upper woofer speaker unit 32 is exposed inside the upper frame 21. The support plate portion 21b is fixed to the upper wall 31e of the speaker housing 31, and the support portion 21a is fixed to the tweeter frame 11, so that the upper frame 21 connects the tweeter portion 10 and the woofer speaker portion 30.

Further, the upper diffuser portion 20 is provided with a diffuser body 22 in the upper frame 21. The diffuser body 22 includes a diffusion portion 22a protruding in a conical shape. The diffuser body 22 is arranged adjacent to the tweeter frame 11 and is fixed to the column portion 21 a of the upper frame 21. The diffusion part 22a has a hollow structure in which the tip of a cone is rounded, and the opposite side of the tip is open. The diffusing portion 22a is arranged such that the tip of the diffusing portion 22a projects toward the upper woofer speaker unit 32 and faces the center of the diaphragm 32a of the upper woofer speaker unit 32. Therefore, the diffusion unit 22a diffuses the sound reproduced by the upper woofer speaker unit 32 around the speaker device 1 substantially uniformly in the direction along the XY plane. For example, when the speaker device 1 is placed on a placement surface parallel to the horizontal plane, the diffusion unit 22a diffuses the sound reproduced by the upper woofer speaker unit 32 in the horizontal direction substantially omnidirectionally over 360 degrees. To do.

FIG. 10 is a side view schematically showing a configuration example of pedestal portion 50 included in speaker device 1 according to the first embodiment and its surroundings. Although the diffuser body 42 is attached to the pedestal portion 50 as shown in FIG. 5, the pedestal portion 50 with the diffuser body 42 removed is shown in FIG. 10.

The pedestal portion 50 is provided with a box-shaped pedestal housing 51 having a square planar shape and flattened in the Z-axis direction. A plurality of legs 1g and a connection plug (not shown) are provided on the bottom of the pedestal housing 51. The connection plug is a connection portion for electrically connecting the music player 101 and the speaker device 1 shown in FIG. Further, as shown in FIG. 10, inside the pedestal housing 51, a circuit board 52 on which circuits for controlling the operations of the upper woofer speaker unit 32 and the lower woofer speaker unit 33 are mounted is provided. The circuit board 52 is arranged so as to project into the lower diffuser portion 40, and is electrically connected to the connection plug. Inside the pedestal housing 51, a weight (not shown) may be provided for improving the stability of the speaker device 1 placed on a placement surface such as a floor.

The description will be made again with reference to FIGS.

The lower diffuser portion 40 is provided with a lower frame 41 having a substantially rectangular parallelepiped outline. The lower frame 41 includes four column parts 41a and four beam parts 41b. Each of the four support columns 41a is arranged apart from each other and is formed so as to extend along the Z-axis direction. Each of the four beam portions 41b connects the adjacent column portions 41a to each other. The four pillars 41 a are arranged at four corners of the square lower wall 31 f of the speaker housing 31 and four lateral corners of the pedestal housing 51, respectively. The four beam portions 41b are respectively arranged at the ends of the column portions 41a on the side of the pedestal housing 51 and extend along the outer edge of the pedestal housing 51. The lower frame 41 connects the woofer speaker section 30 and the pedestal section 50 by fixing the column section 41a to the lower wall 31f of the speaker case 31 and the pedestal case 51.

Further, a diffuser body 42 is provided in the lower frame 41 of the lower diffuser portion 40. The diffuser body 42 includes a diffusion portion 42a protruding in a conical shape. The diffusion part 42a has a hollow structure in which the tip of a cone is rounded, and the opposite side of the tip is open. The diffuser body 42 has the same shape as the diffuser body 22. The diffuser body 42 is disposed adjacent to the pedestal housing 51 and is fixed to the beam portion 41 b of the lower frame 41. The diffusing section 42a is arranged such that the tip of the diffusing section 42a projects toward the lower woofer speaker unit 33 and faces the center of the diaphragm 33a of the lower woofer speaker unit 33. Therefore, the diffusion unit 42a diffuses the sound reproduced by the lower woofer speaker unit 33 around the speaker device 1 substantially uniformly in the direction along the XY plane. For example, when the speaker device 1 is mounted on a mounting surface parallel to the horizontal plane, the diffusion unit 42a causes the sound reproduced by the lower woofer speaker unit 33 to be substantially omnidirectional in the horizontal direction over 360 degrees. Spread.

Further, a detailed configuration of the woofer speaker unit 30 will be described with reference to FIGS. 3 to 5.

The speaker housing 31 of the woofer speaker unit 30 has an upper wall 31e and a lower wall 31f, and side walls 31a, side walls 31b, side walls 31c and 31d adjacent to these walls. The side wall 31a is located on the front surface 1a of the speaker device 1, the side wall 31b is located on the side surface 1b, the side wall 31c is located on the side surface 1c, and the side wall 31d is located on the back surface 1d.

Inside the speaker housing 31, a closed internal space 34 surrounded by an upper woofer speaker unit 32 and a lower woofer speaker unit 33, side walls 31a to 31d, an upper wall 31e, and a lower wall 31f is formed. ing. In the upper woofer speaker unit 32 and the lower woofer speaker unit 33, for example, as shown in FIG. 5, the diaphragm 32 a and the diaphragm 33 a respectively face the internal space 34 and the outside of the speaker housing 31. Are arranged as follows. Further, the upper woofer speaker unit 32 and the lower woofer speaker unit 33 are arranged in the internal space 34 at positions separated from each other in the Z-axis direction. The volume of the internal space 34 may be relatively small as the volume of the speaker housing, for example, about 800 cubic cm. Each of the side wall 31a, the side wall 31b, the side wall 31c, and the side wall 31d is an example of a side wall portion of the speaker housing.

An acoustic port 35 is formed on the side wall 31d located on the rear surface 1d (hereinafter, also referred to as "rear surface side wall 31d"), as shown in an example in FIG. The acoustic port 35 is a bass reflex port opened in a circular shape. The acoustic port 35 is formed by circularly penetrating a port plate 35a fitted in the rear side wall 31d.

Hereinafter, description will be given with reference to FIGS.

FIG. 8 is a side view schematically showing an example of the internal structure of speaker device 1 according to the first embodiment. FIG. 8 shows a side view of the speaker device 1 shown in FIG. 7 as seen from the side wall 31c side with the side wall 31a of the speaker housing 31 removed.

FIG. 9 is a perspective view schematically showing a configuration example of the acoustic tube 36 of the speaker device 1 according to the first embodiment. FIG. 9 shows the acoustic tube 36 of the speaker device 1 shown in FIG. 7 alone.

In the internal space 34 of the speaker housing 31, between the upper woofer speaker unit 32 and the lower woofer speaker unit 33, an acoustic tube 36 having a circular inner tube cross section is provided. The acoustic tube 36 is formed by spirally extending around the upper woofer speaker unit 32 and the lower woofer speaker unit 33. Specifically, the acoustic tube 36 drives a cylindrical vibration generating portion (also referred to as a magnetic circuit portion) 32b that drives the diaphragm 32a of the upper woofer speaker unit 32 and a diaphragm 33a of the lower woofer speaker unit 33. It has a shape that circulates around the cylindrical vibration generating portion (magnetic circuit portion) 33b. A structure for vibrating the vibrating plate 32a or the vibrating plate 33a according to an audio signal is arranged inside each of the vibration generating unit (magnetic circuit unit) 32b and the vibration generating unit (magnetic circuit unit) 33b.

The acoustic tube 36 may be formed, for example, in a spiral shape so that the bend is smooth and the bend angle is gentle. Further, the acoustic tube 36 may be formed by being bent uniformly. Furthermore, the acoustic tube 36 may be formed so as to have an outer diameter as large as possible so as to come into contact with the side walls 31a, 31b, 31c, and 31d of the speaker housing 31. In the first embodiment, the acoustic tube 36 is formed in a shape having a large outer diameter so as to be close to the side wall 31a, the side wall 31b, the side wall 31c, and the side wall 31d.

The flange 36a at one end of the acoustic tube 36 is connected to the port plate 35a (see FIGS. 4 and 9). The acoustic tube 36 has substantially the same inner diameter as the acoustic port 35 and communicates with the acoustic port 35. The other end 36 b of the acoustic tube 36 is open in the internal space 34 of the speaker housing 31. The acoustic tube 36 and the acoustic port 35 communicate the outside of the speaker housing 31 and the internal space 34 with each other. Further, the opening of the end portion 36b of the acoustic tube 36 is covered with a sound absorbing material 37 (acoustic absorber) (see FIG. 6). The sound absorbing material 37 is configured to have a function of braking/absorbing sound. The sound absorbing material 37 can be formed of a material such as polyester. The sound absorbing material 37 functions to dampen resonance generated due to the length of the acoustic tube 36 (that is, the port length). That is, the sound absorbing material 37 has an effect of damping resonance caused by the port length. The acoustic tube 36 is fixed to the side wall 31d on the back side of the speaker housing 31 via the frame member of the port plate 35a and the sound absorbing material 37. The sound absorbing material 37 is not essential and may not be provided.

The upper woofer speaker unit 32, the lower woofer speaker unit 33, the acoustic port 35, the acoustic tube 36, and the speaker housing 31 as described above constitute a bass reflex type speaker. In the speaker device 1 which is a bass reflex speaker, the elasticity of the air in the internal space 34 and the acoustic mass of the acoustic tube 36 and the acoustic port 35 are determined by the diaphragm 32a of the upper woofer speaker unit 32 and the lower woofer speaker unit. It is possible to resonate by receiving the vibration of the diaphragm 33a of 33. That is, the speaker device 1 can resonate with the bass reflex.

When there is no resonance, the sound emitted to the front surfaces of the diaphragm 32a and the diaphragm 33a and the sound emitted to the rear surface of the diaphragm 32a and the diaphragm 33a are originally in opposite phases. However, in the speaker device 1, due to the bass reflex resonance, a phase rotation of the sound radiated to the back surfaces of the diaphragm 32a and the diaphragm 33a occurs. Therefore, the air in the internal space 34 resonating near the bass reflex resonance frequency is combined with the air discharged from the diaphragm 32a and the diaphragm 33a toward the diffuser body 22 and the diffuser body 42. Thereby, in the speaker device 1, the sound pressure can be increased. In addition, the resonating air may be able to reduce the amplitude of diaphragm 32a and diaphragm 33a. The bass reflex resonance frequency is a resonance frequency at the time of bass reflex resonance.

The bass reflex resonance frequency Fb is shown by the following formula.
Fb=((1/MC)^(1/2))/2π
(The symbol ^ represents exponentiation)
Note that M is an element related to the acoustic mass of the acoustic tube 36, and C is an element related to the volume of the internal space 34. Due to the bass reflex resonance, an increase in sound pressure by the diaphragm 32a and the diaphragm 33a and a decrease in amplitude of the diaphragm 32a and the diaphragm 33a can effectively occur.

In the present embodiment, in order to increase the sound pressure in the deep bass range of the upper woofer speaker unit 32 and the lower woofer speaker unit 33, the bass reflex resonance frequency is preferably the upper woofer speaker unit 32 and the lower woofer speaker unit 33. Is set to a predetermined frequency in the deep bass range, which is lower than the frequency band in which sound can be reproduced. In this case, it is necessary to make the elements M and C large so as to correspond to the low bass reflex resonance frequency. Note that the predetermined frequency in the deep bass range can be, for example, a range of 30 Hz to 50 Hz and a frequency band of sounds in the vicinity thereof, but the present disclosure is not limited to these numerical values.

Further, in the present embodiment, the element M and the element C corresponding to the bass reflex resonance frequency as described above are determined by making the element C relatively small. Specifically, the volume of the internal space 34 related to the element C is preset to a relatively small volume of, for example, about 800 cubic cm, and the element M is made relatively large. That is, in the present embodiment, the acoustic tube 36 is configured so that the acoustic mass becomes relatively large. Then, in order to increase the acoustic mass, the acoustic tube 36 is configured to have a relatively small inner diameter and a relatively long tube length.

In addition, noise is likely to occur due to an increase in the in-pipe velocity, which is the air velocity in the acoustic pipe 36. Therefore, the acoustic tube 36 is configured such that the frequency at which the internal velocity becomes maximum due to the bass reflex resonance becomes a predetermined frequency (for example, a frequency in an ultra-low frequency range that is rarely included in voice and music signals). May be. At this time, the acoustic tube 36 is configured such that the tube length is relatively long. The ultra-low range can be, for example, a range of 10 Hz to 30 Hz and a frequency band of sounds in the vicinity thereof.

Further, in the above description, the inner diameter of the acoustic tube 36 is set to be relatively small in order to increase the acoustic mass, but the inner diameter of the acoustic tube 36 passes through the inside of the long acoustic tube 36. It is set in consideration of suppressing the resistance given to the air.

The inner diameter and the tube length of the acoustic tube 36 are determined based on the conditions as described above. For example, in the present embodiment, when the volume of the internal space 34 is 800 cubic cm and the bass reflex resonance frequency is 40 Hz, the acoustic tube 36 can be configured by setting the inner diameter to 16 mm and the tube length to 450 mm. The acoustic tube 36 is bent to accommodate the relatively long acoustic tube 36 in the relatively small internal space 34.

Further, due to the configurations of the acoustic tube 36 and the internal space 34 as described above, the amplitudes of the diaphragm 32a of the upper woofer speaker unit 32 and the diaphragm 33a of the lower woofer speaker unit 33 in the bass reflex resonance frequency and the frequency band in the vicinity thereof. Can be kept small. When the amplitude of the diaphragm 32a and the diaphragm 33a becomes relatively small in the bass reflex resonance frequency and the frequency band in the vicinity thereof, the sound pressure in the above frequency band is applied to the upper woofer speaker unit 32 and the lower woofer speaker unit 33. The distortion in the reproduced sound can be suppressed by performing the boost control that electrically increases the noise. On the other hand, the boost control is performed on the upper woofer speaker unit 32 and the lower woofer speaker unit 33 in a state where the amplitudes of the diaphragm 32a and the diaphragm 33a are relatively large in the bass reflex resonance frequency and the frequency band in the vicinity thereof. When it is heard, the voice becomes distorted.

Further, the shapes of the acoustic tube 36 and the acoustic port 35 may be set to a smooth shape such as a circle so as to reduce the viscous resistance of the inner surface.

Further, when the bending of the acoustic tube 36 is relatively steep, frictional noise (that is, wind noise) due to air flowing inside relatively increases. In order to suppress this noise, the bending of the acoustic tube 36 may be made relatively smooth, and the bending angle and the bending radius of the acoustic tube 36 may be set relatively large. Furthermore, the bending of the acoustic tube 36 may be uniform. For example, as shown in the present embodiment, the acoustic tube 36 has an outer diameter as large as possible to inscribe the side wall 31a, the side wall 31b, the side wall 31c, and the side wall 31d of the speaker housing 31, and extends in a spiral shape. With such a shape, the speaker device 1 can satisfy the above-described conditions. Further, by making the acoustic tube 36 spiral, the area occupied by the acoustic tube 36 in the internal space 34 can be reduced.

Further, since the acoustic tube 36 is disposed between the diaphragm 32a of the upper woofer speaker unit 32 and the diaphragm 33a of the lower woofer speaker unit 33, the vibration wave of the diaphragm 32a and that of the diaphragm 33a. The vibration waves can be diffused, and interference between the vibration waves can be suppressed. As a result, it is possible to reduce the occurrence of a standing wave due to the interference between the vibration wave of the diaphragm 32a and the vibration wave of the diaphragm 33a. The standing wave affects the resonance of the air in the internal space 34, and is preferably suppressed.

The circuit mounted on the circuit board 52 shown in FIG. 10 controls the operations of the upper woofer speaker unit 32 and the lower woofer speaker unit 33. The control of electrically boosting the operation of can also be performed. Specifically, in the frequency band where the amplitude in the diaphragm 32a of the upper woofer speaker unit 32 and the diaphragm 33a of the lower woofer speaker unit 33 becomes low due to the bass reflex resonance, the circuit mounted on the circuit board 52 is the upper woofer speaker. By increasing the voltage of the signal supplied to the unit 32 and the lower woofer speaker unit 33, boost control is performed to increase the sound pressure of the diaphragm 32a and the diaphragm 33a. The circuit board 52 (or a circuit mounted on the circuit board 52) is an example of the boost controller.

In the woofer unit 60 including the upper diffuser unit 20, the woofer speaker unit 30, and the lower diffuser unit 40 having the above-described configurations, the upper woofer speaker unit 32 has the diaphragm 32a having a relatively small diameter, and the lower side. Even if the woofer speaker unit 33 has the diaphragm 33a having a relatively small diameter, it is possible to reproduce low-pitched sound with low distortion, similarly to a speaker having a diaphragm having a large diameter.

Next, a detailed configuration of the tweeter unit 10 will be described with reference to FIGS. 11 and 12.

FIG. 11 is a perspective view schematically showing a configuration example of the tweeter unit 10 included in the speaker device 1 according to the first embodiment. Note that FIG. 11 is a perspective view of the tweeter unit 10 of the speaker device 1 shown in FIG. 6 viewed from a direction different from FIG.

FIG. 12 is a top view schematically showing a configuration example of the tweeter unit 10 included in the speaker device 1 according to the first embodiment. Note that FIG. 12 is a top view of the tweeter unit 10 shown in FIG. 11 as seen from above, and is a view with the upper wall 13c of the directivity control horn 13 removed.

In the tweeter frame 11, in addition to the three tweeter units 12 and the three directivity control horns 13, a tweeter circuit board 14 on which a circuit for controlling the tweeter units 12 is mounted is provided. The tweeter circuit board 14 is attached to the upper frame 21 of the upper diffuser portion 20 shown in FIG. The circuit mounted on the tweeter circuit board 14 is electrically connected to the three tweeter units 12 and configured to control the operation of the tweeter units 12. Hereinafter, for convenience, each of the three tweeter units 12 is also referred to as a first tweeter unit 121, a second tweeter unit 122, and a third tweeter unit 123. Further, each of the three directional control horns 13 attached to each of the first tweeter unit 121, the second tweeter unit 122, and the third tweeter unit 123 is replaced with a first directional control horn 131 and a second directional control horn 132. Also referred to as a third directional control horn 133.

The first tweeter unit 121 and the first directional control horn 131 are oriented in the direction toward the front surface 1a of the speaker device 1, and the second tweeter unit 122 and the second directional control horn 132 are provided on the side surface 1b of the speaker device 1. The direction is set in the direction toward which the third tweeter unit 123 and the third directional control horn 133 are set in the direction toward the side surface 1c of the speaker device 1. Therefore, the first tweeter unit 121 and the first directional control horn 131, the second tweeter unit 122 and the second directional control horn 132, the third tweeter unit 123 and the third directional control horn 133, respectively. The orientations are substantially perpendicular to each other on a plane substantially parallel to the XY plane (horizontal direction when the speaker device 1 is placed on a placement surface parallel to the horizontal plane). There is. Further, the second tweeter unit 122 and the second directional control horn 132, and the third tweeter unit 123 and the third directional control horn 133 are arranged so that their respective directions are substantially opposite to each other. ing.

Each of the first directional control horn 131, the second directional control horn 132, and the third directional control horn 133 has a fan-shaped bottom wall 13d arranged on the upper diffuser section 20 (see FIG. 6) side and a bottom. It includes a fan-shaped upper wall 13c arranged at a position facing the wall 13d, and a side wall 13a and a side wall 13b arranged between the upper wall 13c and the bottom wall 13d. The top wall 13c and the bottom wall 13d have substantially symmetrical shapes such as mirror images. The side wall 13a and the side wall 13b have a substantially symmetrical shape such as a mirror image.

The first directional control horn 131, the second directional control horn 132, and the third directional control horn 133 have a trumpet shape having a rectangular cross section due to the side wall 13a, the side wall 13b, the upper wall 13c, and the bottom wall 13d. Is formed in.

Further, the side wall 13a, the side wall 13b, the upper wall 13c, and the bottom wall 13d of the first directivity control horn 131 are arranged in the opening 13e to which the first tweeter unit 121 is attached and in the emission direction of the sound reproduced by the first tweeter unit 121. And an opening 13f on the front surface 1a side is formed.

Further, the side wall 13a, the side wall 13b, the upper wall 13c, and the bottom wall 13d of the second directivity control horn 132 are arranged in the opening 13e to which the second tweeter unit 122 is attached and the direction in which the second tweeter unit 122 emits the reproduced sound. And an opening 13f on the side surface 1b side is formed.

Further, the side wall 13a, the side wall 13b, the upper wall 13c, and the bottom wall 13d of the third directivity control horn 133 are arranged in the opening 13e to which the third tweeter unit 123 is attached and in the emission direction of the reproduced sound by the third tweeter unit 123. An opening 13f on the side surface 1c side is formed.

Inside the first directivity control horn 131, the second directivity control horn 132, and the third directivity control horn 133, the side wall 13a, the side wall 13b, the upper wall 13c, and the bottom wall 13d open from the opening 13e. A diffusion path 13g is formed so as to spread like a trumpet toward the portion 13f.

The directions of the first directivity control horn 131, the second directivity control horn 132, and the third directivity control horn 133 are set so that the central axes 13gc of the respective diffusion paths 13g are along the XY plane. .. Note that, in FIG. 11, only the central axis 13gc in the diffusion path 13g of the first directivity control horn 131 is shown by a chain line, and the other central axes 13gc are omitted. The center axis 13gc is an axis that is equidistant from each of the side wall 13a and the side wall 13b, and is also equidistant from each of the top wall 13c and the bottom wall 13d. Thus, when the speaker device 1 is placed on the placement surface parallel to the horizontal plane, the central axes 13gc of the first directional control horn 131, the second directional control horn 132, and the third directional control horn 133, respectively. Is substantially parallel to the horizontal plane. That is, when the speaker device 1 is used in a normal use state, the central axes 13gc of the first directional control horn 131, the second directional control horn 132, and the third directional control horn 133 are horizontally oriented. Become substantially parallel.

In the upper wall 13c of each of the first directional control horn 131, the second directional control horn 132, and the third directional control horn 133, the diffusion path 13g expands in the Z-axis direction from the opening 13e to the opening 13f. Thus, the upper diffuser portion 20 is inclined to the opposite side (top plate 3 side). Furthermore, the width of each upper wall 13c is increased so that the diffusion path 13g expands from the opening 13e toward the opening 13f in the direction along the XY plane. In the opening 13f, the width of each upper wall 13c extends to the two adjacent pillars 11b.

In the bottom wall 13d of each of the first directional control horn 131, the second directional control horn 132, and the third directional control horn 133, the diffusion path 13g expands in the Z-axis direction from the opening 13e to the opening 13f. So that it is inclined toward the upper diffuser portion 20 side. Furthermore, the width of each bottom wall 13d is increased so that the diffusion path 13g expands from the opening 13e toward the opening 13f in the direction along the XY plane. In the opening 13f, the width of each bottom wall 13d extends to the two adjacent pillars 11b.

The bottom wall 13d may be formed to be substantially parallel to the XY plane without being inclined toward the upper diffuser portion 20 side from the opening 13e toward the opening 13f, or the upper diffuser. It may be formed so as to be inclined to the opposite side of the portion 20. In the first embodiment, the upper wall 13c is inclined from the opening 13e toward the opening 13f toward the opposite side of the upper diffuser portion 20. Therefore, when the speaker device 1 is placed on a placement surface substantially parallel to the horizontal plane, that is, when the speaker device 1 is in a normal use state, the tweeter unit 12 reproduces the directional control horn 13. The sound is directed so as to diffuse in the Z-axis upward direction from the bottom wall 13d to the top wall 13c.

The side wall 13a and the side wall 13b of each of the first directivity control horn 131, the second directivity control horn 132, and the third directivity control horn 133 have a diffusion path 13g on the XY plane from the opening 13e toward the opening 13f. It is formed along the edges of the upper wall 13c and the bottom wall 13d so as to expand in the direction along the. The side wall 13a includes a bent portion 13aa on the way from the opening 13e to the opening 13f, and the side wall 13b includes a bent portion 13ba on the way from the opening 13e to the opening 13f. Each of the side wall 13a and the side wall 13b is bent at the bent portion 13aa and the bent portion 13ba so that the distance between them is increased from the opening 13e toward the opening 13f. Therefore, the increase rate of the width of the diffusion path 13g from the opening 13e to the opening 13f is higher in the bending portion 13aa and the bending portion 13ba to the opening 13f than in the opening 13e to the bending portion 13aa and the bending portion 13ba. Is big.

The first directional control horn 131, the second directional control horn 132, and the third directional control horn 133 having the above-described configurations respectively include the first tweeter unit 121, the second tweeter unit 122, and the third tweeter unit. The sound reproduced by 123 can be diffused in the direction along the side walls 13a and 13b (direction along the XY plane) and in the direction along the top wall 13c and bottom wall 13d (Z-axis direction). Further, each of the first directivity control horn 131, the second directivity control horn 132, and the third directivity control horn 133 has the curved side wall 13a and side wall 13b as described above, so that the direction along the XY plane is achieved. It is possible to control the sound directivity range (for example, in the horizontal direction). That is, the first directional control horn 131, the second directional control horn 132, and the third directional control horn 133 are reproduced by the first tweeter unit 121, the second tweeter unit 122, and the third tweeter unit 123, respectively. It is possible to control the direction of the sound so as to diffuse the sound while limiting most of the sound to be made within a directivity range of a predetermined directivity angle (for example, 90 degrees in the horizontal direction).

This operation will be specifically described with reference to FIG. As shown in FIG. 12, the first directional control horn 131 reproduces most of the sound reproduced by the first tweeter unit 121, and the second directional control horn 132 reproduces most of the sound reproduced by the second tweeter unit 122. The third directivity control horn 133 causes most of the sound reproduced by the third tweeter unit 123 to be diffused while limiting most of the sound reproduced by the third tweeter unit 123 within the directivity range A of the directivity angle α in the direction along the XY plane. , Respectively configured. In the present embodiment, the directivity range A is set between the line segment L1 and the line segment L2 for each of the first directivity control horn 131, the second directivity control horn 132, and the third directivity control horn 133. The area may be. The line segment L1 and the line segment L2 are line segments that pass from the diffusion reference point C to both ends of the opening 13f, specifically, the center of the column 11b. The diffusion reference point C is a virtual point set on the back of the first tweeter unit 121, the second tweeter unit 122, and the third tweeter unit 123. In FIG. 12, the line segment L1 and the line segment L2 are shown with a dashed-dotted line. The angle formed by the line segment L1 and the line segment L2 is the directivity angle α.

In this embodiment, the directivity angle α is 90 degrees. When designing the directivity control horn 13 of the directivity angle α (the first directivity control horn 131, the second directivity control horn 132, and the third directivity control horn 133), sounds of all frequencies are set to the directivity angle α. Designing to point within the pointing range A is not always required. Each of the first directional control horn 131, the second directional control horn 132, and the third directional control horn 133 includes a tweeter unit 12 (first tweeter unit 121, second tweeter unit 122, or third tweeter unit 123). May be designed to be directed within the directivity range A, or a sound of a frequency that the tweeter unit 12 can suitably reproduce, or a sound of a frequency that the tweeter unit 12 normally reproduces.

The first directional control horn 131, the second directional control horn 132, and the third directional control horn 133 are arranged so that their respective directional ranges A are adjacent to each other but do not substantially wrap in the direction along the XY plane. Has been placed. As a result, the reproduction sound of the first tweeter unit 121 and the reproduction of the second tweeter unit 122, which are emitted via the first directivity control horn 131, the second directivity control horn 132, and the third directivity control horn 133, respectively. Interference between the sound and the reproduced sound of the third tweeter unit 123 is suppressed. As a result, the speaker device 1 outputs the reproduced sounds of the first tweeter unit 121, the second tweeter unit 122, and the third tweeter unit 123 to the front face 1a, the side face 1b, and the side face 1c except the rear face 1d of the speaker device 1. That is, the sound can be emitted with a substantially uniform sound pressure in a wide directional range extending over 270 degrees in the XY plane. That is, the speaker device 1 in a normal usage state can reproduce substantially omnidirectional sound over 270 degrees in the horizontal direction.

It should be noted that the directivity ranges A of the first directivity control horn 131, the second directivity control horn 132, and the third directivity control horn 133 are adjacent to each other but do not substantially overlap each other. Including two cases.

The first case is a case where there is a slight gap between adjacent directivity ranges A. However, the gap is such that changes in sound pressure, sound quality, and the like between the directivity range A and the region of the gap do not substantially appear as changes in the measurement result.

The second case is a case where the adjacent directivity ranges A are directly adjacent to each other without any gap or overlap.

The third case is a case where adjacent directional ranges A slightly overlap each other. However, this overlap is such that a change in sound pressure, sound quality, etc. due to interference in the overlap area, when compared with the directivity range A, does not substantially appear as a change in the measurement result.

[1-3. Example of speaker device]
The characteristics of the woofer part were compared and examined between one example 1 of the speaker device 1 according to the present embodiment and a comparative example 1 of a closed type speaker device instead of the bass reflex type.

In the first embodiment, in the woofer portion 60, the speaker housing 31 has an internal volume of 800 cubic cm, the acoustic port 35 and the acoustic tube 36 have a diameter of 16 mm, and the acoustic tube 36 has a length of 450 mm. Further, the upper woofer speaker unit 32 and the lower woofer speaker unit 33 had a diameter of 8 cm and a frequency band of 100 Hz to 5000 Hz. The bass reflex resonance frequency was set to 40 Hz. Regarding the internal dimensions of the speaker housing 31, the width in the X-axis direction was about 9 cm, the depth in the Y-axis direction was about 9 cm, and the height in the Z-axis direction was about 10 cm.

In Comparative Example 1, as compared to Example 1, the acoustic port 35 and the acoustic tube 36 were not provided, and the speaker housing was sealed. Further, the internal volume of the speaker housing was 800 cubic cm. Other configurations in Comparative Example 1 are similar to those in Example 1.

FIG. 13 is a diagram schematically showing an example of the relationship between the sound pressure and frequency of the woofer unit 60 included in the speaker device 1 according to the first embodiment. FIG. 13 shows the relationship between the sound pressure and the frequency of the woofer part having two woofer speaker units for Example 1 and Comparative Example 1, Example 1 is a solid line graph, and Comparative Example 1 is a broken line graph. Is shown. In FIG. 13, the vertical axis represents sound pressure (unit: dB), and the horizontal axis represents frequency (unit: Hz).

FIG. 14 is a diagram schematically showing an example of the relationship between the amplitude and frequency of the diaphragm of the woofer speaker unit included in the speaker device 1 according to the first embodiment. FIG. 14 shows the relationship between the amplitude and the frequency of the diaphragm of the woofer speaker unit in the woofer part for Example 1 and Comparative Example 1, in which Example 1 is a solid line graph and Comparative Example 1 is a broken line graph. Showing. In FIG. 14, the vertical axis represents amplitude (unit: mm) and the horizontal axis represents frequency (unit: Hz).

FIG. 15 is a diagram schematically showing an example of the relationship between impedance and frequency of a woofer speaker unit included in speaker device 1 according to the first embodiment. FIG. 15 shows the relationship between the impedance and the frequency of the woofer speaker unit in the woofer section for Example 1 and Comparative Example 1, in which Example 1 is a solid line graph and Comparative Example 1 is a broken line graph. .. In FIG. 15, the vertical axis represents impedance (unit: Ω) and the horizontal axis represents frequency (unit: Hz).

As shown in FIG. 13, in Example 1, the sound pressure of the woofer portion 60 (bass range) was higher than that in Comparative Example 1 in the frequency band near 40 Hz, which is the bass reflex resonance frequency, due to the influence of the bass reflex resonance. There is.

On the other hand, as shown in FIG. 14, in the frequency band around 40 Hz which is the bass reflex resonance frequency, the amplitude of the diaphragm of the woofer speaker unit in Example 1 is suppressed to be significantly smaller than that in Comparative Example 1. As described above, in the first embodiment, since the amplitude of the diaphragm is suppressed in the deep bass region near 40 Hz, it is possible to secure sound quality and sound reliability.

Further, as shown in FIG. 15, the impedance of the woofer speaker unit in the first embodiment is affected by the diaphragm speed due to bass reflex resonance, and two peaks are generated in the low range. The impedance of Comparative Example 1 has only one peak because the speaker housing has a closed structure and has one resonance system. In Example 1, there is a bass reflex resonance frequency between the two peaks. Then, the lower the impedance around the frequency, the more efficiently the amplitude of the diaphragm can be suppressed small.

[ 1-4 . Effect, etc.]
As described above, in the present embodiment, the speaker device includes the speaker housing, the first speaker unit provided on the first wall portion of the speaker housing, and the sound that communicates between the inside and the outside of the speaker housing. And a tube. The acoustic tube has a predetermined length and is spirally bent and accommodated in the speaker housing.

The speaker device 1 is an example of a speaker device. The speaker housing 31 is an example of a speaker housing. One of the upper wall 31e and the lower wall 31f is an example of the first wall portion. One of the upper woofer speaker unit 32 and the lower woofer speaker unit 33 is an example of a first speaker unit. The acoustic tube 36 is an example of an acoustic tube.

For example, in the example shown in the first embodiment, the speaker device 1 includes the speaker housing 31 and the upper woofer speaker unit 32 (or the upper woofer speaker unit 32 provided on the upper wall 31e (or the lower wall 31f) of the speaker housing 31 (or, A lower woofer speaker unit 33) and an acoustic tube 36 that communicates the inside and outside of the speaker housing 31. The acoustic tube 36 has a predetermined length and is housed in the speaker housing 31 by being spirally bent. The upper woofer speaker unit 32 and the lower woofer speaker unit 33 may be attached to the speaker housing 31 so as to face the inside and the outside of the speaker housing 31.

In the speaker device 1 thus configured, the gas in the speaker housing 31 (that is, the gas in the internal space 34) is generated by the vibration of the upper woofer speaker unit 32 (or the lower woofer speaker unit 33). , Resonates at a specific frequency. The speaker device 1 can raise the sound pressure near the resonance frequency due to the resonance of the gas in the speaker housing 31. The resonance frequency of the gas in the speaker housing 31 changes according to the length of the acoustic tube 36. Further, in the speaker device 1, since the acoustic tube 36 is bent and housed in the speaker housing 31, the length of the acoustic tube 36 is longer than that in the case where the acoustic tube is not spirally bent. can do. Therefore, even when it is necessary to form the acoustic tube 36 to be relatively long in order to set the resonance frequency to the target frequency, the speaker device 1 has the relatively long acoustic tube 36 in the speaker housing 31. Can fit. Thereby, the amplitude of the diaphragm 32a of the upper woofer speaker unit 32 (or the amplitude of the diaphragm 33a of the lower woofer speaker unit 33) can be reduced in the deep bass range. Further, by making the acoustic tube 36 spiral, the bending of the acoustic tube 36 can be increased and the bending can be made uniform. As a result, noise generated at the bent portion of the acoustic tube 36 can be suppressed.

In the speaker device, the predetermined length of the acoustic tube is set so that the frequency of the speaker unit when the velocity of the gas in the acoustic tube becomes maximum due to the resonance of the gas in the speaker housing is lower than the predetermined frequency. May be done.

For example, in the example shown in the first embodiment, in the speaker device 1, the predetermined length of the acoustic tube 36 is such that the gas velocity in the acoustic tube 36 (internal velocity) is due to the resonance of the gas in the speaker housing 31. The frequency of the upper woofer speaker unit 32 (or the lower woofer speaker unit 33) at the maximum is set to be lower than a predetermined frequency.

In the speaker device 1, when the velocity of gas in the acoustic tube 36 (internal velocity) increases, noise is likely to occur. The frequency of the upper woofer speaker unit 32 (or the lower woofer speaker unit 33) when the noise becomes maximum (that is, the velocity of gas in the acoustic tube 36 (internal velocity) becomes higher than the predetermined frequency). By lowering (for example, lowering to a bass frequency band that includes almost no sound that the upper woofer speaker unit 32 or the lower woofer speaker unit 33 can reproduce), the noise audible to the user is significantly reduced. be able to. The predetermined frequency at this time may be, for example, a bass frequency equal to or lower than the lowest sound that can be reproduced by the upper woofer speaker unit 32 or the lower woofer speaker unit 33.

The speaker device may further include a second speaker unit provided on the second wall portion of the speaker housing facing the first wall portion.

The other of the upper wall 31e and the lower wall 31f is an example of the second wall portion. The other of the upper woofer speaker unit 32 and the lower woofer speaker unit 33 is an example of a second speaker unit.

For example, in the example shown in the first embodiment, the speaker device 1 includes the upper woofer speaker unit 32 provided on the upper wall 31e of the speaker housing 31 and the lower wall 31f of the speaker housing 31 facing the upper wall 31e. And a lower woofer speaker unit 33 provided in the.

In the speaker device 1 configured in this way, by providing a plurality of woofer speaker units (the upper woofer speaker unit 32 and the lower woofer speaker unit 33), even if the woofer speaker units are small, a high-pitched sound is produced. The sound can be reproduced with pressure.

In the speaker device, the acoustic tube may be arranged between the first speaker unit and the second speaker unit which are arranged opposite to each other.

For example, in the example shown in the first embodiment, in the speaker device 1, the acoustic tubes 36 are arranged opposite to each other (that is, arranged in opposite directions) to the upper woofer speaker unit 32 and the lower woofer speaker unit. It is arranged between 33 and.

In the speaker device 1 configured as described above, the acoustic tube 36 includes the vibration waves generated by the diaphragm 32a of the upper woofer speaker unit 32 and the diaphragm 33a of the lower woofer speaker unit 33, which are arranged to face each other. Can be suppressed, and the generation of standing waves caused by the interference between vibration waves can be suppressed. Therefore, in the speaker device 1, the influence of the standing wave on the resonance of the gas in the speaker housing 31 can be suppressed.

In the speaker device, at least a part of at least one of the first speaker unit and the second speaker unit may be arranged inside the spiral of the acoustic tube.

For example, in the example shown in the first embodiment, in the speaker device 1, a part of the upper woofer speaker unit 32 and a part of the lower woofer speaker unit 33 are arranged inside the spiral of the acoustic tube 36.

In the speaker device 1 configured in this way, the distance between the upper woofer speaker unit 32 and the lower woofer speaker unit 33 can be reduced. Therefore, the speaker housing 31 can be miniaturized in the direction from the upper wall 31e to the lower wall 31f (Z-axis direction). In the speaker device 1, all of the upper woofer speaker unit 32 and the lower woofer speaker unit 33 may be arranged inside the spiral of the acoustic tube 36.

In the speaker device, the acoustic tube has a spiral shape so as to be close to a side wall portion of the speaker housing formed between the second wall portion and the first wall portion of the speaker housing facing the first wall portion. You may stretch.

The side wall 31a, the side wall 31b, the side wall 31c, and the side wall 31d are each an example of a side wall portion.

For example, in the example shown in the first embodiment, in the speaker device 1, the acoustic tube 36 includes the side wall 31a, the side wall 31b, the side wall 31c, and the side wall of the speaker housing formed between the upper wall 31e and the lower wall 31f. It is helically stretched so as to be close to each of 31d.

In the speaker device 1 thus configured, the diameter of the spiral of the acoustic tube 36 can be relatively increased. As a result, in the speaker device 1, since the bending diameter of the acoustic tube 36 is relatively large and the bending is relatively gentle, it is possible to suppress noise generated in the bending portion of the acoustic tube 36.

The speaker device further includes a boost controller that controls the speaker unit so as to increase the sound pressure of the speaker unit when the frequency of the speaker unit is in the resonance frequency of the gas in the speaker housing and the frequency band near the resonance frequency. May be.

The circuit board 52 (or the circuit mounted on the circuit board 52) is an example of the boost controller.

For example, in the example shown in the first embodiment, in the speaker device 1, the frequencies of the upper woofer speaker unit 32 and the lower woofer speaker unit 33 are in the resonance frequency of the gas in the speaker housing 31 and the frequency band near the resonance frequency. The circuit board 52 is provided with a circuit for boost controlling the upper woofer speaker unit 32 and the lower woofer speaker unit 33 so as to increase the sound pressure of the upper woofer speaker unit 32 and the lower woofer speaker unit 33 at a certain time.

In the speaker device 1, when the frequencies of the upper woofer speaker unit 32 and the lower woofer speaker unit 33 are in the resonance frequency and the frequency band near the resonance frequency, the diaphragm 32a of the upper woofer speaker unit 32 and the lower woofer speaker unit 33 are included. The amplitude of the vibration plate 33a becomes small. However, in the speaker device 1, the boost control increases the sound pressure in the frequency band in which the amplitudes of the diaphragm 32a and the diaphragm 33a are small, so that it is possible to ensure the sound quality after the sound pressure is increased by the boost.

The speaker device may further include a diffuser body provided outside the speaker housing at a position facing the first speaker unit and diffusing sound output from the first speaker unit in a predetermined direction.

Each of the diffuser body 22 and the diffuser body 42 is an example of a diffuser body.

For example, in the example shown in the first embodiment, the speaker device 1 is provided outside the speaker housing 31 at a position facing the upper woofer speaker unit 32, and a sound output from the upper woofer speaker unit 32 is predetermined. The diffuser body 22 diffuses in the direction of. Further, the speaker device 1 is provided outside the speaker housing 31 at a position facing the lower woofer speaker unit 33, and diffuses a sound output from the lower woofer speaker unit 33 in a predetermined direction. Equipped with.

In the speaker device 1 configured in this way, the reproduced sound from the upper woofer speaker unit 32 can be spread over a wide area in a predetermined direction, and the reproduced sound by the lower woofer speaker unit 33 can be spread over a wide area in a predetermined direction. be able to. Therefore, the speaker device 1 can expand the directivity range of the reproduced sound by the upper woofer speaker unit 32 and the lower woofer speaker unit 33. Further, the diffuser body 22 or the diffuser body 42 may change the direction of the sound emitted from the upper woofer speaker unit 32 or the lower woofer speaker unit 33 to collide with itself and diffuse the sound.

In the speaker device, the predetermined direction is a direction extending 360 degrees in the horizontal direction centered on the speaker device when the speaker device is installed so that the first wall portion is located above or below the speaker housing. Good.

For example, in the example shown in the first embodiment, in the speaker device 1, the diffuser body 22 and the diffuser body 42 diffuse sound (predetermined direction) with the upper wall 31e (or the lower wall 31f) as the speaker casing. When the speaker device 1 is installed so as to be located above (or below) the body 31 (that is, when the speaker device 1 is placed on a placement surface parallel to the horizontal plane), the speaker device 1 is used as a center. The horizontal direction is 360 degrees.

In the speaker device 1 thus configured, the reproduced sounds from the upper woofer speaker unit 32 and the lower woofer speaker unit 33 are diffused in a wide range over the entire periphery of the speaker device 1.

The speaker device 1 according to the present embodiment includes a plurality of tweeter units 12, and a plurality of directivity controls that are attached to the plurality of tweeter units 12 and limit the spread of the sound emitted by the tweeter units 12 within a predetermined directivity range. And a horn 13. Further, the adjacent directivity control horns 13 are arranged adjacent to each other so that their directivity ranges do not substantially overlap. In the speaker device 1 configured in this way, the reproduced sounds from the plurality of tweeter units 12 are diffused by the plurality of directivity control horns 13 over a plurality of directivity ranges. Furthermore, in the speaker device 1, it is possible to prevent the sounds emitted from each of the plurality of directivity control horns 13 in different directions from interfering with each other. Further, since the directivity control horn 13 limits the directivity range of the reproduced sound from each tweeter unit 12, the reproduced sound is emitted over a wide range while maintaining a constant sound pressure. Therefore, the sound emitted from the plurality of directivity control horns 13 is suppressed in turbulence and diffused in a wide range. As a result, the user can listen to the reproduced sound by the tweeter unit 12 in a relatively wide range of listening positions with a sound quality that does not change.

In the speaker device 1 according to the present embodiment, the directivity control horns 13 are arranged in a substantially horizontal direction such that their directivity ranges are adjacent to each other. The speaker device 1 configured as described above can widely diffuse sound in the horizontal direction by the plurality of directivity control horns 13. Therefore, in the speaker device 1, it is possible to reduce the directivity of the sound reproduced by the tweeter unit 12 in the horizontal direction.

Speaker device 1 according to the present embodiment integrally includes tweeter unit 10 and woofer unit 60. Then, in the speaker device 1, each of the upper woofer speaker unit 32 and the lower woofer speaker unit 33 of the speaker housing 31 is configured to improve the sound quality in the deep bass region, and the tweeter unit having the directivity control horn 13 is provided. By configuring 12 so as to improve the sound quality in the treble range, it is possible to improve the sound quality of the reproduced sound from the deep bass range to the treble range.

(Other embodiments)
As described above, the first embodiment has been described as an example of the technique disclosed in the present application. However, the technology in the present disclosure is not limited to this, and can be applied to the embodiment in which changes, replacements, additions, omissions, etc. are appropriately made. Further, it is also possible to combine the respective constituent elements described in the above-described first embodiment and other embodiments below to form a new embodiment.

Therefore, other embodiments will be exemplified below.

In the first embodiment, in the speaker device 1, the woofer speaker unit 30 includes the two woofer speaker units, that is, the upper woofer speaker unit 32 and the lower woofer speaker unit 33. However, the present disclosure is not limited to this configuration example. The woofer speaker unit 30 may include one woofer speaker unit or three or more woofer speaker units.

In the first embodiment, in the speaker device 1, the acoustic tube 36 included in the woofer speaker section 30 is a spiral tube having a circular cross section and smoothly curved. However, the present disclosure is not limited to this configuration example. The acoustic tube 36 may have a predetermined tube length and a predetermined tube internal cross-sectional area. The internal cross-sectional shape of the acoustic tube 36 is not limited to a circle, and may be a polygon such as a rectangle, an ellipse, or an oval. The shape of the acoustic tube 36 is not limited to the spiral shape, and may be any shape as long as it can be accommodated in the internal space 34. When the acoustic tube 36 has a shape with a bend, it may be, for example, a spiral shape, and has a shape that reciprocates in the internal space 34 in the Z axis direction, a shape that reciprocates in the X axis or Y axis direction, or It may have a combined shape.

In the first embodiment, in the speaker device 1, the configuration example in which all the acoustic tubes 36 included in the woofer speaker unit 30 are included in the internal space 34 of the speaker housing 31 has been described. However, the present disclosure is not limited to this configuration example. A part of the acoustic tube 36 may extend to the outside of the speaker housing 31.

In the first embodiment, in the speaker device 1, the tweeter unit 10 has been described as having a configuration example in which the tweeter unit 12 and the directivity control horn 13 are provided in three sets. However, the present disclosure is not limited to this configuration example. The set of the tweeter unit 12 and the directivity control horn 13 included in the tweeter unit 10 may be two sets or four sets. For example, in the configuration example in which the tweeter unit 10 includes four sets of the tweeter unit 12 and the directivity control horn 13, the tweeter unit 10 is substantially omnidirectional around the speaker device 1 over 360 degrees in the horizontal direction. The sound can be reproduced. In a configuration example in which the tweeter unit 10 includes two sets of the tweeter unit 12 and the directional control horn 13, by changing the directivity angle of the directional control horn 13, it is possible to reproduce nondirectional sound over a wide area. ..

In the first embodiment, in the speaker device 1, the tweeter unit 10 includes the three directional control horns 13 having the directional angle of 90 degrees. However, the present disclosure is not limited to this configuration example. The directivity angle of the directivity control horn 13 may be other than 90 degrees. Although the configuration example in which the tweeter units 12 are arranged at right angles to each other has been described in the first embodiment, the directivity angle of the directivity control horn 13 may be an angle other than 90 degrees in other cases. Further, the directivity angles of the plurality of directivity control horns 13 may be different from each other.

In the first embodiment, in the tweeter unit 10 of the speaker device 1, the three directional control horns 13 have the configuration example in which the respective central axes 13gc are arranged along the XY plane. However, the present disclosure is not limited to this configuration example. In the tweeter unit 10, the central axis 13gc of the directivity control horn 13 may be along any plane.

In the first embodiment, the speaker device 1 has the configuration example in which the tweeter unit 10 is arranged on the woofer unit 60. However, the present disclosure is not limited to this configuration example. The arrangement form and the arrangement order of the woofer portion 60 and the tweeter portion 10 may be arbitrary.

In the first embodiment, in the woofer portion 60 of the speaker device 1, the upper woofer speaker unit 32 and the lower woofer speaker unit 33 are arranged vertically. However, the present disclosure is not limited to this configuration example. The woofer portion 60 may be arranged in any orientation.

In the first embodiment, the configuration example in which the speaker device 1 integrally includes the tweeter unit 10 and the woofer unit 60 has been described. However, the present disclosure is not limited to this configuration example. The speaker device 1 may be configured to include only one of the tweeter unit 10 and the woofer unit 60.

In the first embodiment, in the speaker device 1, the circuit mounted on the circuit board 52 (see FIG. 10) controls the upper woofer speaker unit 32 and the lower woofer speaker unit 33 by boosting the sound pressure ( A configuration example of performing boost control) is shown. However, the present disclosure is not limited to this configuration example. The boost control of the upper woofer speaker unit 32 and the lower woofer speaker unit 33 may be performed by a device external to the speaker device 1. For example, the music player 101 may boost control the upper woofer speaker unit 32 and the lower woofer speaker unit 33. FIG. 16 shows a configuration example in that case.

FIG. 16 is a block diagram showing a configuration example of components related to boost control of the woofer speaker unit included in the speaker device 1 according to the first embodiment. When boost control of the upper woofer speaker unit 32 and the lower woofer speaker unit 33 is performed by the music player 101, the music player 101 includes a boost circuit 101a that performs boost control, as shown in the block diagram of FIG. And an amplifier 101b. The boost circuit 101a boosts a signal received from a music source 101c such as a CD player or a radio included in the music player 101, or an external music source 201 such as an external device with which the music player 101 communicates. The amplifier 101b amplifies the boosted signal and transmits it to the upper woofer speaker unit 32 and the lower woofer speaker unit 33 of the speaker device 1. The acoustic system 100 including the speaker device 1 may be configured in this way. At this time, the circuit mounted on the circuit board 52 may not have the control function of the upper woofer speaker unit 32 and the lower woofer speaker unit 33. The circuit board 52 only has a function as a relay board that relays the electrical connection between the signal line (lead) connected from the music player 101 to the speaker device 1 and the upper woofer speaker unit 32 and the lower woofer speaker unit 33. It may be configured to have. Further, the circuit board 52 may relay the electrical connection between the leads connected to the speaker device 1 from the music player 101 and the tweeter unit 12.

In the first embodiment, in the speaker device 1, the circuit mounted on the tweeter circuit board 14 (see FIG. 12) of the tweeter unit 10 controls the tweeter unit 12 by way of example. However, the present disclosure is not limited to this configuration example. The control of the tweeter unit 12 may be performed by a device external to the speaker device 1. For example, the music player 101 may control the tweeter unit 12. At this time, the tweeter circuit board 14 includes leads connected to the speaker device 1 from the music player 101, or leads extending from the music player 101 via the circuit board 52 of the pedestal housing 51, the tweeter unit 12, and the tweeter unit 12. It may be configured to have only a function as a relay board that relays the electrical connection of.

In the present embodiment, the expression “frequency of the speaker unit” is used, but this means “frequency of sound being reproduced by the speaker unit” or “frequency of sound being reproduced by the speaker unit”. is there.

As described above, the embodiments have been described as examples of the technology according to the present disclosure. To that end, the accompanying drawings and detailed description are provided.

Therefore, among the components described in the accompanying drawings and the detailed description, not only the components essential for solving the problem but also the components not essential for solving the problem in order to exemplify the above technology Can also be included. Therefore, it should not be immediately recognized that these non-essential components are essential, even if those non-essential components are described in the accompanying drawings or the detailed description.

Further, since the above-described embodiment is for exemplifying the technique in the present disclosure, various changes, replacements, additions, omissions, etc. can be made within the scope of the claims or the scope of equivalents thereof.

The present disclosure can be applied to a speaker device and a device including the speaker device. Specifically, the present disclosure is applicable to an audio system including a music player, an audiovisual system including a monitor such as a television, and a device including various speaker devices such as a personal computer.

1 Speaker device 1a Side (front)
1b, 1c side surface 1d side surface (back surface)
1e Top face 1f Bottom face 2 Exterior net 3 Top plate 10 Tweeter part 11 Tweeter frame 11a Upper edge part 11b Strut part 11c Rear wall part 12 Tweeter unit 13 Directional control horn 13a, 13b Side wall 13aa, 13ba Bending part 13c Upper wall 13d Walls 13e, 13f Opening 14 Tweeter circuit board 20 Upper diffuser part 21 Upper frame 21a Strut part 21b Support plate part 22,42 Diffuser body 22a, 42a Diffusion part 30 Woofer speaker part 31 Speaker housing 31a, 31b, 31c, 31d Side wall 31e Upper wall 31f Lower wall 32 Upper woofer speaker unit 32a, 33a Vibration plate 33 Lower woofer speaker unit 34 Internal space 35 Acoustic port 35a Port plate 36 Acoustic tube 36a Flange 36b End 37 Sound absorbing material 40 Lower diffuser part 41 Lower Frame 41a Strut part 41b Beam part 50 Pedestal part 51 Pedestal case 52 Circuit board 60 Woofer part 100 Acoustic system 101 Music player 101a Boost circuit 110 Operation part 101b Amplifier 101c Music source 121 First tweeter unit 122 Second tweeter unit 123 Third Tweeter unit 131 First directivity control horn 132 Second directivity control horn 133 Third directivity control horn 201 External music source A Directive range C Diffusion reference point L1, L2 Line segment

Claims (9)

Speaker housing,
A first speaker unit provided on the first wall portion of the speaker housing;
A second speaker unit provided on the second wall portion of the speaker housing facing the first wall portion;
An acoustic tube that connects the inside and the outside of the speaker housing,
Equipped with
The acoustic tube has a predetermined length and is spirally bent and housed in the speaker housing.
Speaker device. The acoustic tube is arranged between the first speaker unit and the second speaker unit, which are arranged in mutually opposite directions,
The speaker device according to claim 1. At least a part of at least one of the first speaker unit and the second speaker unit is arranged inside the spiral of the acoustic tube,
The speaker device according to claim 2. Speaker housing,
A first speaker unit provided on the first wall portion of the speaker housing;
An acoustic tube that connects the inside and the outside of the speaker housing,
Equipped with
The acoustic tube has a predetermined length and is formed between the second wall portion of the speaker housing and the first wall portion facing the first wall portion, and the side wall portion of the speaker housing. Is spirally bent and housed in the speaker housing so as to be close to
Speaker device. A diffuser body that is provided outside the speaker housing and faces the first speaker unit, and diffuses a sound output from the first speaker unit in a predetermined direction.
The speaker device according to claim 1. The predetermined direction is a direction extending 360 degrees in a horizontal direction centered on the speaker device when the speaker device is installed such that the first wall portion is located above or below the speaker housing. ,
The speaker device according to claim 5. The predetermined length of the acoustic tube is such that the frequency of the first speaker unit or the second speaker unit when the velocity of the gas in the acoustic tube becomes maximum due to the resonance of the gas in the speaker housing, Set to be lower than frequency,
The speaker device according to claim 1. The sound pressure of the first speaker unit and the second speaker unit when the frequencies of the first speaker unit and the second speaker unit are in the resonance frequency of the gas in the speaker housing and the frequency band near the resonance frequency. Further comprising a boost controller for controlling the first speaker unit and the second speaker unit so as to increase.
The speaker device according to claim 1. The internal cross-sectional shape of the acoustic tube is circular or elliptical,
The speaker device according to claim 1.

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